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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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Related Experiment Video

Updated: Sep 10, 2025

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Posterior parietal cortex activity during visually cued gait: a preliminary study.

Paul McDonnell1, Adam B Grimmitt2, Jonaz Moreno Jaramillo2

  • 1Movement Neuroscience Laboratory, Department of Kinesiology, University of Massachusetts Amherst, 30 Eastman Lane, Amherst, MA, 01003, USA.

Experimental Brain Research
|August 25, 2025
PubMed
Summary
This summary is machine-generated.

The posterior parietal cortex (PPC) shows increased activity during visually guided walking, suggesting its role in visuospatial processing for safe gait. PPC activity during visually cued gait correlates with stride time variability.

Keywords:
Gait variabilityInertial measurement unitMobile neuroimagingPrecision steppingWalkingfNIRS

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Movement Science

Background:

  • Safe gait relies on visually guided (VC) step adjustments for navigating environments.
  • The posterior parietal cortex (PPC) is crucial for visuospatial processing, but its role in human gait is not fully understood.
  • Cortical control of gait, particularly in visually complex settings, influences gait variability and fall risk, especially in older adults.

Purpose of the Study:

  • To investigate posterior parietal cortex (PPC) activity during visually cued (VC) gait and perturbed (VCP) gait.
  • To examine the relationship between PPC activity and gait variability under different visual guidance conditions.

Main Methods:

  • Twenty-one healthy young adults participated in treadmill walking under three conditions: non-cued (NC), VC gait, and VCP gait.
  • Functional near-infrared spectroscopy (fNIRS) measured relative changes in oxygenated hemoglobin (ΔHbO2) in the PPC.
  • Inertial measurement units (IMUs) quantified gait variability.

Main Results:

  • A moderate increase in PPC ΔHbO2 was observed from NC to both VC and VCP gait, indicating heightened visuospatial processing demands.
  • Stride time variability positively correlated with PPC ΔHbO2 during VC gait.
  • These findings suggest the PPC's involvement in modulating temporal gait characteristics during visually guided locomotion.

Conclusions:

  • The PPC plays a role in visuospatial processing required for visually guided gait adjustments.
  • PPC activity is linked to gait variability, potentially influencing gait adaptability.
  • Further research in older adults is needed to understand the PPC's role in age-related gait changes and fall risk.